David Grinspoon
David Grinspoon is an astrobiologist, award-winning author, and one of the world's most engaging communicators of planetary science. Senior Scientist at the Planetary Science Institute and former Senior Scientist for Astrobiology Strategy at NASA, he studies how climate evolves on Earth-like planets, where life might exist elsewhere, and how human activity is reshaping our own world. He currently serves on the science team for NASA's upcoming DAVINCI mission to Venus, and in 2013 became the inaugural Chair of Astrobiology at the U.S. Library of Congress. Winner of the Carl Sagan Medal for public communication, a frequent voice on StarTalk Radio, and the author of Earth in Human Hands and Lonely Planets, he brings the search for life in the universe vividly to life. He even has an asteroid named after him. Onboard, his lectures connect the wonders of the cosmos to the living planet beneath our feet.